That named would be the Demented Alchemist, level 38 ^^ with three or so other corrupted halfing mobs as well. I got this ring from the encounter as well.
This ring is a drop off a named halfling in Rivervale. As soon as you zone from EL, keep to the left and can be found in the first house on the left. There are some corrupted brigands walking around outside the house. The named came from within the house, unfortunately I don’t remember the exact name L. It was a blue double up con to me at lvl 41.